Ammeter vs Voltmeter: Error Comparison

In summary, the conversation discusses the potential sources of error when performing a lab to calculate voltage and current through different resistance values. The main question is which type of circuit (parallel, series, or a combination of both) contributes more error. The conversation also mentions the importance of knowing the voltmeter and ammeter's impedance as well as the value of R in order to minimize the instruments' influence. It is suggested that circuit diagrams would be a better way to convey these questions.
  • #1
lexylouloo
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Which one contributes more error when performing a lab calculating the voltage and current through different ohms of resistance? One was in parallel, the others in series and the last one both in series and parallel.
They are systematic errors, but not sure which one would contribute more error?
thanks :) really confused on this circuit stuff
 
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  • #2
It's almost impossible to give an answer without knowing some numbers.
What's the voltmeter's impedance?
What's the ammeter's impedance?
Do you know something about the value of R?

These numbers let us decide whether to use the "short" or "long" connections to minimize instruments' influence
 
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  • #3
Circuit diagrams are always the better way to convey such questions.
 

1. What is the difference between an ammeter and a voltmeter?

An ammeter measures the flow of electric current, while a voltmeter measures the voltage or potential difference between two points in a circuit.

2. How do ammeters and voltmeters compare in terms of accuracy?

Ammeters tend to have a lower accuracy compared to voltmeters because they are typically placed in series with the circuit, which can affect the current flow. Voltmeters, on the other hand, are placed in parallel with the circuit and have a higher accuracy due to the minimal impact on the voltage being measured.

3. Can using an ammeter or voltmeter cause errors in a circuit?

Yes, using ammeters and voltmeters can cause errors in a circuit. Ammeters can introduce resistance and change the current flow, while voltmeters can draw a small amount of current from the circuit, which can also affect the voltage being measured.

4. How can errors in ammeters and voltmeters be minimized?

To minimize errors, it is important to use the appropriate type of ammeter or voltmeter for the circuit being measured. Additionally, using high-quality instruments with proper calibration and avoiding overloading the instruments can also help minimize errors.

5. Which is more suitable for measuring current and voltage in a circuit - an ammeter or voltmeter?

This depends on the specific measurement needed in the circuit. If the goal is to measure the flow of current, an ammeter would be more suitable. If the goal is to measure the voltage or potential difference, a voltmeter would be more suitable. It is important to use the correct instrument for the specific measurement being taken.

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